关键词: 浮式生产储油卸油装置, 上部模块, 支墩结构, 有限元分析, 疲劳评估

Abstract: The module support structure is the connection structure between the topside module and the main deck of FPSO. The design of module support structure should consider the loads such as the weight of the topside module, inertial force and wind load, along with the influence of the overall bending deformation of the hull girder. The fatigue strength of the support structure therefore should be considered at the beginning of the design. This paper conducts the fatigue assessment of the topside module support structure for FPSO. The simplified fatigue assessment method based on the linear fatigue cumulative damage theory is used for the fatigue analysis with consideration of various working conditions during the life cycle of the FPSO in service. In the process, the important data of the fatigue assessment are successfully obtained with the help of the finite element analysis software. The dangerous area of the support structure fatigue damage and the main causes of fatigue are analyzed. The analysis results can be used as references for the detailed node design of the module support structure in the future.

Key words: topside module, support structure, finite element analysis, fatigue assessment